期刊
PLANT BREEDING
卷 132, 期 2, 页码 133-143出版社
WILEY
DOI: 10.1111/pbr.12037
关键词
single-nucleotide polymorphism; pasture; grass; legume; sequencing; breeding programme
资金
- Victorian Department of Primary Industries
- Dairy Australia
- Geoffrey Gardiner Dairy Foundation
- Meat and Livestock Australia through the Molecular Plant Breeding and Dairy Futures Cooperative Research Centres
Genomic selection (GS) is a powerful method for exploitation of DNA sequence polymorphisms in breeding improvement, through the prediction of breeding values based on all markers distributed genome-wide. Forage grasses and legumes provide important targets for GS implementation, as many key traits are difficult or expensive to assess, and are measured late in the breeding cycle. Generic attributes of forage breeding programmes are described, along with status of genomic resources for a representative species group (ryegrasses). Two schemes for implementing GS in ryegrass breeding are described. The first requires relatively little modification of current schemes, but could lead to significant reductions in operating cost. The second scheme would allow two rounds of selection for key agronomic traits within a time period previously required for a single round, potentially leading to doubling of genetic gain rate, but requires a purpose-designed reference population. In both schemes, the limited extent of linkage disequilibrium (LD), which is the major challenge for GS implementation in ryegrass breeding, is addressed. The strategies also incorporate recent advances in DNA sequencing technology to minimize costs.
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